Seattle to Washington Dulles (SEA → IAD). We are tracking 8 fares on this route.
Cheapest tracked fare $138 · typical price $283 · you save about $145 (51%)
Cheapest fares we're tracking
Airline
Departs
Stops
Price
American Airlines
2026-10-06
1 stop
$138
—
2026-10-07
1 stop
$145
—
2026-09-26
1 stop
$145
Alaska Airlines
2026-09-04
Direct
$164
Frontier Airlines
2026-11-16
3 stops
$174
—
2027-01-20
2 stops
$188
—
2027-02-17
2 stops
$188
—
2027-02-03
2 stops
$188
Could you save more?
The airport you were going to fly from is often not the cheapest one. Compare every airport in a region against each other, or check whether a multi-day stopover beats the direct fare.
How cheap can flights from Seattle to Washington Dulles get?
The cheapest fare we have tracked on this route is $138, compared with a typical $283 for a trip of this distance.
Is it cheaper to fly to Washington Dulles from a different airport?
Often, yes. Fares out of secondary airports are frequently cheaper than the obvious hub, but they are the ones most likely to be missing from a normal search. Our reverse search compares every airport in a region against each other so the cheaper departure point is not hidden.
Could a stopover make Seattle to Washington Dulles cheaper?
Sometimes. On thin long-haul routes a two-leg trip with a multi-day stopover can beat the direct fare, and occasionally a direct fare is not sold at all. Our detour search prices those routings against the direct flight.